821
WWUS20 KWNS 290627
SEL8
SPC WW 290627
OKZ000-TXZ000-291200-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 778
NWS STORM PREDICTION CENTER NORMAN OK
120 AM CDT THU OCT 29 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
SOUTHERN OKLAHOMA
NORTH CENTRAL TEXAS
EFFECTIVE THIS THURSDAY MORNING FROM 120 AM UNTIL 700 AM CDT.
TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE
MILES EITHER SIDE OF A LINE FROM 25 MILES NORTH OF MCALESTER
OKLAHOMA TO 40 MILES WEST OF CORSICANA TEXAS. FOR A COMPLETE
DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE
(WOUS64 KWNS WOU8).
REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.
DISCUSSION...STORMS HAVE BEEN SLOWLY STRENGTHENING THE PAST COUPLE
OF HOURS ACROSS NRN TEXAS. WARM FRONT EXTENDED FROM NEAR FSI TO
GGG...AND DEWPOINTS NEAR 70 IN THE WARM SECTION APPEARED TO BE
AIDING IN THE DEVELOPMENT OF NEAR SURFACE BASED STORMS. THE
COMBINATION OF THIS MOIST ENVIRONMENT AND 1 KM SHEAR AT 40-50 KT
WILL BE FAVORABLE FOR ROTATING STORMS AND TORNADOES. AS THE WARM
FRONT CONTINUES TO RETREAT NWD THROUGH THE EARLY MORNING HOURS...THE
THREAT FOR TORNADOES WILL SPREAD INTO SRN OK.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.
MEAN STORM MOTION VECTOR 20040.
...IMY
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